Jacob, will be a Slytherin...he's obnoxious, cunning and won't stop until he gets what he wants...in his case the girl he loves...although he is a loyal friend, his friendship to Bella only counted as long as he got what he wanted, if Renesmee wasn't born he would have happily attacked Edward (or Bella) after her change...

These violent delights, have violent endings...Like fire and gunpowder, they consume what they kiss

Well, I can see why Griffyndor's winning, although I think loyalty is a stronger quality for him than bravery. I don't really see the Slytherin thing, but then I don't see him as cunning, don't think obnoxiousness is exclusively a Slytherin quality (re: Ron), and think of his loyalty to his pack (read: tribe, family) more than his loyalty to Bella. He certainly counts as hardworking - after taking care of his father and their barely-working vehicles all this time, he's working himself into exhaustion trying to protect everybody.

Oooh, I think Gryffindor! Remember that there's more to the houses than just smart, brave, cunning, and loyal! *Has read Harry Potter 47 times ^///^* Gryffindors are the most hot-headed and reckless of all the houses. Their actions can sometimes be motivated by emotion, as opposed to what is most sensible. And of course he's very brave :)